cumminas



(No Model.) 2 Sheets-Sheet 1.

U. CUMMINGS.

STONE DRESSING MACHINE.

110,376,296. Patented-Jan. 10,1888.

"In u r I Z 4 14 i v 1 J g' s il I a 2. III! W556 da Inv enZor g $5M W N. PETERS, P mkml-ilhogmpher. Wnshinmnn n c 2 MW e h S W e e h S 2 S G N I M M U NU .U

(No Model.)

STONE DRESSING MAGHINE, No. 376,296.

129.5 Patented Jan. 10, 1888.

IIHIIIIIIIHJIIIIHHIHIIIIIHIIIIHHIIHHIIIH I 4121/?73205. }7f eases. (3:9

N PETERS. Pllomuuw hl hy. Washmmom D. c.

T0 at whom it may concern:

UNITED STATES PATENT Fries.

URIAH CUMMINGS, or

BUFFALO, NEW YORK.

STONE-DRESSING MACHINE.

' SPECIFICATION forming part of Letters Patent No. 376,296, dated January 10, 1888.

Application filed October 30, 1886. Serial No. 217,560. (No model.)

Be it known that I, URIAH CUMMINGS, of the city of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Stone-Dressing Machines, of which the following is a specification.

This invention relates to a stone-dressing machine in which the dressingtool is operated loya piston receiving a reciprocating motion in asuitable cylinder.

The object of my invention is to produce a' stone-dressing machine by which the operation of dressing the stone is effected more expeditiousl y and with greater accuracy than by the means heretofore employed; and my in-', vention consists of the improvements which will be hereinafter fullydescribed,and pointed out in the claims.

In the accompanying drawings, consisting of two sheets, Figure l is a sectional elevation of my improved stone dressing machine. Fig. 2 is a vertical section in linear a, Fig. 1. Fig. 3 is a rear elevation of the machine. Fig. 4 is a top plan viewof the same.

Like letters of reference refer to like parts in the several figures.

A is the dressing tool or bit, which is of a suitable form to produce a surface of the de: sired character, Whether plane, furrowed, or otherwise. 7

B is the head, in the under side of which the dressing-tool is secured by dovetailing or otherwise, and b is a piston-rod which extends upwardly from the head B.

O is the piston, secured to the piston-rod 6 within a vertical cylinder, D. r

d d represent stuffing-boxes, formed in th upper and lower heads of thecylinder D and embracing the piston-rod b, which latter is preferably made polygonal in cross-section in order to prevent the piston-rod and the dressing-tool attached thereto from turning. Any other suitable guide or device which prevents rotary movement of the piston-rod about its axis may, however, be employed, ifpreferred.

E represents the frame by which the cylinder D is supported, and which extends rearwardly and downwardly from the cylinder.

F represents the valve-chest, formed in the upper portion of the frame E, andf the rockvalve, arranged in the same, whereby the flow of the actuating-fluid toward and from the cylinder is controlled.

9 represents the supply -pipe, which constem on the outer side of the valve-chest, and

I is a link connecting said arm with a lever, 1- .The latter is pivoted with its front end to the piston-rod above the cylinder and with its rear end to a link, J, which finds its support on an arm, J, mounted on a horizontal shaft, 3', which isjournaled in the frame E.

K represents a hand-lever secured to the opposite end of the shaftj and provided with a spring-bolt, k, which engages with a notched segment, Z, secured to the frame F, whereby the hand-lever is held in position. The valve f is operated by the lever I, link I, and arm I in such manner that the actuating-fluid is alternately admitted to opposite ends of the cylinder and exhausted therefrom, whereby a rapid reciprocating motion of the piston-rod and dressing-tool is produced. By adjusting the hand-lever K the time at which the actuatingfluid is admitted below the piston on the downward stroke can be regulated so as to increase or reduce the force of the blow and the length of stroke. By adjusting the valve the height at which the tool stands in its lowest position can be nicely regulated, as may be necessary to adjust it to the work,which is especially desirable in dressing millstones, and as thecylinder is rigidly secured to its supporting-frame the blows of the tool have no injurious effect upon the connection of the cylinder and frame.

L represents the bed-frame of the machine, which is secured to the stone to be dressed by hook-bolts Z, or other suitable means. The bed-frame L is provided in its upper portion with horizontal ways or grooves m, in which the frame E is guided by ribs or projections n.

0 represents a horizontal rack-bar secured at its ends to the bed-frame L, and p is an opening formed in the lower portion ofthe frame E, through which the rack-bar passes.

Q is a gear-wheel, engaging with the rackbar and secured to a horizontal shaft, q, which is journaled in the frameE and provided on the rearside of thelatter withahand-wheel,

9. Upon turning the wheel Q, by means of said hand-wheel, the frame E is moved in the ways in, thereby moving the dressing-tool over the surface to be dressed.

it is obvious that a feed screw and nut may be substituted for the rack bar and wheel, if preferred.

R represents the exhaust-pipe extending downwardly from the exhaust-port and tcrmi nating near the dressing-tool, so as to deliver a biast upon the stone near the dressing-tool, whereby the chips and dust are removed as fast as they are formed.

S represents an extension of the bed-frame, arranged in front of the dressingtool and secured at its ends to the bed-frame L.

The dressiug'tool delivers, in rapid sucoes sion, blows of uniform force, and produces rapidly a uniformly-dressed surface of the desired form, whether plane, grooved, or otherwise, and effects the operation of dressing in less time, at less expense, and with greater accuracy and uniformity than heretofore. I prefer compressed air, as the actuating-fluid, to steam, because it keeps the surface of the Stone 0 ry.

My improved dressingmachine is very de' sirable for dressing millstones, but may be employed with great advantage for dressing other kinds of stones.

I claim as my invention- 1. The combination of the dressing-tool, of a piston and rod to which said tool is attached, an actuating-cylinder in which the piston rcciprocates, a frame to which said cylinder is rigidly secured, a bed upon which said frame 40 is moved to bring the dressing-tool over difierout parts of the surface to be dressed, and a valve and adjustable valvegear whereby the stroke of the tool can be regulated, substantially as set forth. 4

2. The combination, with the bed L, pro vided with a rack-bar, O, of a frame, E, provided with a pinion meshing with said rackbar, a cylinder, D, valve-chest F, vaivef, and valve-gear mounted on the frame E, a piston, 50 O, and rod Z), and a dressing-tool, A, attached to the rod 1), substantially as set forth.

Vitness my hand this th day of October, 1886.

URIAH GUMMING S.

Witnesses:

CARL F. GEYER, J No. J. BONNER. 

